Mnemosyne is crashing often on Ubuntu 18.04

[vi...@calday.co.uk]

Hi,

First of all, thank you for continuing to develop Mnemosyne - I don't know how school would be going for me without it.

My problem is that Ubuntu crashes very often on Ubuntu 18.04 - so I ran it using the terminal, so that I could try to debug it. I got error messages straight away (there's a lot here):

libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
QIODevice::write (QProcess): device not open
QIODevice::write (QProcess): device not open
nouveau: kernel rejected pushbuf: Invalid argument
nouveau: ch6: krec 0 pushes 1 bufs 13 relocs 0
nouveau: ch6: buf 00000000 00000002 00000004 00000004 00000000
nouveau: ch6: buf 00000001 00000006 00000004 00000000 00000004
nouveau: ch6: buf 00000002 0000003f 00000002 00000000 00000002
nouveau: ch6: buf 00000003 00000040 00000004 00000004 00000000
nouveau: ch6: buf 00000004 00000008 00000002 00000000 00000002
nouveau: ch6: buf 00000005 00000002 00000004 00000004 00000000
nouveau: ch6: buf 00000006 0000000a 00000002 00000002 00000002
nouveau: ch6: buf 00000007 00000008 00000002 00000002 00000000
nouveau: ch6: buf 00000008 00000006 00000004 00000000 00000004
nouveau: ch6: buf 00000009 0000001a 00000002 00000000 00000002
nouveau: ch6: buf 0000000a 00000007 00000002 00000002 00000000
nouveau: ch6: buf 0000000b 0000003f 00000002 00000002 00000000
nouveau: ch6: buf 0000000c 0000003b 00000002 00000002 00000000
nouveau: ch6: psh 00000005 0000006164 000000632c
nouveau:     0x80000671
nouveau:     0x800004b9
nouveau:     0x80ff0e04
nouveau:     0x200504d0
nouveau:     0x00008006
nouveau:     0x00004001
nouveau:     0x00004303
nouveau:     0x00008006
nouveau:     0x00004001
nouveau:     0x200104d6
nouveau:     0x00004001
nouveau:     0x800103e4
nouveau:     0x20010680
nouveau:     0x00001111
nouveau:     0x2001054f
nouveau:     0x00000000
nouveau:     0x200308e0
nouveau:     0x00010000
nouveau:     0x00000000
nouveau:     0x00480000
nouveau:     0xa01d08e3
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0xbf800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x200308e0
nouveau:     0x00010000
nouveau:     0x00000000
nouveau:     0x004c0000
nouveau:     0xa00908e3
nouveau:     0x00000000
nouveau:     0xffffffff
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x20024062
nouveau:     0x00000000
nouveau:     0x00550040
nouveau:     0x20024060
nouveau:     0x00000020
nouveau:     0x00000001
nouveau:     0xa009406c
nouveau:     0x00001001
nouveau:     0x58d24908
nouveau:     0x02350000
nouveau:     0x00600000
nouveau:     0x00070020
nouveau:     0xe88002ea
nouveau:     0x800001ed
nouveau:     0x03000000
nouveau:     0x00000000
nouveau:     0x200104cd
nouveau:     0x00000000
nouveau:     0x200308e0
nouveau:     0x00010000
nouveau:     0x00000000
nouveau:     0x00520000
nouveau:     0x200208e3
nouveau:     0x00000020
nouveau:     0x00000002
nouveau:     0x20030700
nouveau:     0x0000100c
nouveau:     0x00000000
nouveau:     0x02001000
nouveau:     0x200207c0
nouveau:     0x00000000
nouveau:     0x02001047
nouveau:     0x20030704
nouveau:     0x00001008
nouveau:     0x00000000
nouveau:     0x02001100
nouveau:     0x200207c2
nouveau:     0x00000000
nouveau:     0x0200112f
nouveau:     0x20010586
nouveau:     0x00000004
nouveau:     0x2002035d
nouveau:     0x00000000
nouveau:     0x00000006
nouveau:     0x80000585
nouveau:     0x200406c0
nouveau:     0x00000000
nouveau:     0x00014000
nouveau:     0x00000008
nouveau:     0x1000f010
nouveau: ch6: psh 00000005 000000632c 0000006340
nouveau:     0x200406c0
nouveau:     0x00000000
nouveau:     0x00014000
nouveau:     0x00000009
nouveau:     0x1000f010
nouveau: kernel rejected pushbuf: Invalid argument
nouveau: ch6: krec 0 pushes 2 bufs 13 relocs 0
nouveau: ch6: buf 00000000 00000002 00000004 00000004 00000000
nouveau: ch6: buf 00000001 00000006 00000004 00000000 00000004
nouveau: ch6: buf 00000002 0000003f 00000002 00000000 00000002
nouveau: ch6: buf 00000003 00000040 00000004 00000004 00000000
nouveau: ch6: buf 00000004 00000008 00000002 00000000 00000002
nouveau: ch6: buf 00000005 00000002 00000004 00000004 00000000
nouveau: ch6: buf 00000006 0000000a 00000002 00000002 00000002
nouveau: ch6: buf 00000007 00000008 00000002 00000002 00000000
nouveau: ch6: buf 00000008 00000006 00000004 00000000 00000004
nouveau: ch6: buf 00000009 0000001a 00000002 00000000 00000002
nouveau: ch6: buf 0000000a 00000007 00000002 00000002 00000000
nouveau: ch6: buf 0000000b 0000003f 00000002 00000002 00000000
nouveau: ch6: buf 0000000c 0000003b 00000002 00000002 00000000
nouveau: ch6: psh 00000005 0000006164 000000632c
nouveau:     0x80000671
nouveau:     0x800004b9
nouveau:     0x80ff0e04
nouveau:     0x200504d0
nouveau:     0x00008006
nouveau:     0x00004001
nouveau:     0x00004303
nouveau:     0x00008006
nouveau:     0x00004001
nouveau:     0x200104d6
nouveau:     0x00004001
nouveau:     0x800103e4
nouveau:     0x20010680
nouveau:     0x00001111
nouveau:     0x2001054f
nouveau:     0x00000000
nouveau:     0x200308e0
nouveau:     0x00010000
nouveau:     0x00000000
nouveau:     0x00480000
nouveau:     0xa01d08e3
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x3f800000
nouveau:     0x3f800000
nouveau:     0x00000000
nouveau:     0x00000000
nouveau:     0x00000000
Segmentation fault (core dumped)

This seems odd to me as I've never had any errors with Mnemosyne - and when I develop things on my own, I only get segmentation faults working with C.

Thanks.

Student Account
Calday Grange Grammar School is a charitable company limited by guarantee and registered in England and Wales with company number 8332696.
The Registered Office is at Grammar School Lane, West Kirby, Wirral, CH48 8GG

[Peter Bienstman (UGent-imec)]

This seems to suggest issue with libraries Mnemosyne is using. I suggest trying to upgrade or downgrade Pyqt.

Perhaps you can also try with Ubuntu's own Mnemosyne package.

Cheers,

Peter

---

From: vi...@calday.co.uk
Sent: Sunday, 8 December 2019 11:16
To: mnemosyne-proj-users
Subject: [mnemosyne-proj-users] Mnemosyne is crashing often on Ubuntu 18.04

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[vi...@calday.co.uk]

Much to my dismay, Mnemosyne keeps getting buggier - here are the errors:

libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
QIODevice::write (QProcess): device not open

QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
nouveau: kernel rejected pushbuf: No such file or directory

[Andreas Perstinger]

On 08.12.19 11:15, vi...@calday.co.uk wrote:
> My problem is that Ubuntu crashes very often on Ubuntu 18.04 - so I ran it
> using the terminal, so that I could try to debug it. I got error messages
> straight away (there's a lot here):
>
> libpng warning: iCCP: known incorrect sRGB profile
> libpng warning: iCCP: known incorrect sRGB profile
> libpng warning: iCCP: known incorrect sRGB profile
> libpng warning: iCCP: known incorrect sRGB profile
> libpng warning: iCCP: known incorrect sRGB profile
> QIODevice::write (QProcess): device not open
> QIODevice::write (QProcess): device not open
> nouveau: kernel rejected pushbuf: Invalid argument

^^^^^^^

It looks like you have a NVIDIA graphics card and I've found several
reports on the internet describing problems with the open source graphic
driver nouveau and QT.

One workaround may be setting an environment variable before starting the
application:

QT_XCB_FORCE_SOFTWARE_OPENGL=1 mnemosyne

You could also try to use the proprietary nvidia driver for your graphics
card.

Bye, Andreas

[Oisín Mac Fhearaí]

I've observed the same problem many times. It's a problem with the open source nouveau driver for Nvidia cards, as Andreas points out. Unfortunately I've had poor experiences with this driver on two different machines, and it's both difficult to debug and apparently low priority in the Linux world.

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